After a frame is show, remove() and add() a TextComponent or Canvas could cause
 WINDOW_DEICONIFIED and WINDOW_ICONIFIED events so the frame will end up showing in ICONIFIED state.

import java.awt.*;

/*
 * Run this test, the frame will be shown in ICONIFIED state
 * because three Window Events were generated:
 * WINDOW_ICONFIED
 * WINDOW_DEICONFIED
 * WINDOW_ICONFIED
 * Deleting the last two lines, frame will show in normal state
 */
public class ExcessiveTest extends java.applet.Applet {
    static TextField t = new TextField("Nothing is more fun");

    public void init() {
        add("North", new Button("Nothing is more fun"));
        add("South", t);
        // problem identified with three new components so far
        // add("South", new TextArea("Nothing is more fun"));
        // add("South", new TextField("Nothing is more fun"));
        // add("South", new Canvas());
    }

    public static void main(String argv[]) {
        ExcessiveTest a = new ExcessiveTest();

        Frame f = new Frame("Test Frame");
        
        f.add(a);

        a.init();
        a.start();
        f.pack();
        f.setVisible(true);

        // comment out the following two lines, it shows as normal
        a.remove(t);
        a.add(t);
    }
}